I rebooted into 412f and could not reproduce text errors in FF or tkhearts. I haven't seen this but I agree it could be graphics driver related. Maybe try another option in xorgwizard and see if that makes any difference.
The only other thing I can suggest is copy and paste these commands into a terminal:
Code: Select all
modprobe nls_cp850
modprobe nls_utf8
-TazOC